- PLASTIC LIMIT TEST MANUAL
- PLASTIC LIMIT TEST SERIES
Squeeze the pieces together, knead between the thumb and first finger of each hand, reform into an ellipsoidal mass, and re-roll.
When the diameter of the thread becomes 3.2 mm, break the thread into several pieces. 
During this rolling process, the end the soil thread shall not contact the side rail. Simultaneously apply a slight downward force and back and forth motion to the top plate so that the top plate comes into contact with the side rails within 2 min. Place the soil mass on the bottom plate at the midpoint between the slide rails.Place the top plate in contact with the soil mass. Soil samples are automatically reduced to individual particle sizes for Atterberg Limits or Grain Size testing.įor more information, see our blog Atterberg Limits: A Quick Reference Guide.Fig.5:performing plastic limit test on soil sample Rolling Device Method: attach smooth unglazed paper to both the top and bottom plates of the plastic limit-rolling device. Soil Grinder is an alternative method to traditional mortar and pestle methods for sample reduction.Shrinkage Limit Set is a complete kit with all the equipment necessary to determine the ASTM D4943 test for shrinkage limits of cohesive soils.Atterberg Limits/Grain Size Accessories include spatulas, wash bottles, mortar & pestles, evaporating dishes, sample containers, and graduated cylinders used for Atterberg limits and grain size testing.Liquid Limit/Plastic Limit Test Accessory Set is made up of laboratory tools needed to perform Atterberg limit tests in accordance with ASTM D4318.
All include a brass cup, carriage for drop control, and a set of plastic Casagrande grooving tools for determining the liquid limit.
PLASTIC LIMIT TEST MANUAL
Liquid Limit Machines are available in automated or manual models, with or without a counter. The patented design reduces operator error and meets standard test method requirements. Plastic Limit Roller device saves time and improves test results for plastic limit specimens. High-quality materials and rugged construction ensure accuracy and long service life. These soils will expand in wet conditions and shrink in dry conditions.Ītterberg limit test equipment from Gilson meets ASTM D4318, ASTM D4943, and other standard test methods. Soils with an activity number of more than 1.25 are considered active and will show a greater chance of volume in response to moisture conditions. Activity Number of a soil is the ratio of the PI to the clay fraction (particles finer than 2µm). As CI increases, the firmness, or shear strength of the soil also increases. It is related to the LI and is an indicator of relative shear strength. Consistency Index, or CI, is the liquid limit of the soil, minus the natural moisture content, divided by the PI. The LI allows the prediction of soil properties at different moisture. A LI of 0 or lower indicates soils that are harder and more brittle. 
Soils with a LI of 1 or more will be closer to the liquid state.
Liquidity Index, or LI, is determined by subtracting the plastic limit from the natural water content of the sample, then dividing by the PI. If the PI value is higher than the low to mid-20s, the soil may be expansive under wet conditions or exhibit shrinkage in dry conditions. 
Soils with a high PI have a higher clay content.
Plasticity Index, or PI, is the plastic limit subtracted from the liquid limit and indicates the size of the range between the two boundaries. Shrinkage limit is the water content at which the further loss of moisture does not cause a decrease in the volume of a specimen.Ītterberg soil indexes are calculated from the test results of liquid and plastic limits tests to classify soil types and properties:. Plastic limit is the water content when soil can no longer be rolled into a 1/8in (3.2 mm) diameter thread without crumbling. Liquid limit is defined as the water content at which soil changes from a plastic state to a liquid state when testing in a liquid limit machine. PLASTIC LIMIT TEST SERIES
Albert Atterberg, a Swedish agricultural scientist, established the boundaries of soil consistency in 1911 with a series of simple tests:
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